A Study On The Technology Of Digital Watermarking In Two-Dimension Barcode

Digital watermarking is a branch of the information hiding, and it is a new research field in copyright protection of digital works, as the internet and multimedia technology developing increasingly. This paper mainly combines the 2D Barcode technology and digital watermarking technology, improving the depth and width of the 2D Barcode in anti-counterfeiting technology. Experimental results proved watermarking scheme has certain practical value.In this paper, an overall review on the digital watermarking technology is made in details, including the background, meanings and state of arts. Summarize the basic principle of digital watermarking technology, the development situation and the application of 2D Barcode technology. This paper mainly put forward three kinds of watermark scheme, according to the specific watermark demand in practical use of 2D Barcode.1. A digital watermarking scheme for QR Code image is presented in the third part of this paper. Firstly fuzzy the QR image and add noise according to the particularity of QR Code image, to reduce the correlation between the image space pixels and prevent QR Code overflowing in DCT domain. Then embed the watermarking by the comparision of the mid-frequency coefficients in DCT. Experimental results show that this scheme has the anti-print scanning characteristics.2. A double image watermarking scheme for QR Code image is presented in the No.4 part of this paper. Firstly preprocess the watermarking by Arnold scrambling technology. Then use singular value decomposition(SVD) and data classification method to embed the double watermarking, experimental results show that the proposed scheme can solve the contradiction between robustness and invisibility.3. A digital holographic watermarking scheme for QR Code image is put forward. Because a digital holographic watermark itself cannot be torn and the characteristics of wavelet multi-resolution, the HH1 part of the watermark after wavelet replace the HH2 part of the original image to achieve a good characteristics in anti-crop and resistance in JPEG lossy compression.